| Event Id | 15102 |
| Source | DNS Intrusion Detection |
| Description | ISA Server detected an Internet Protocol (IP) half-scan attack from IP address %1. |
| Event Information |
According to Microsoft : CAUSE : A possible Internet Protocol (IP) half-scan attack was attempted against a computer protected by ISA Server. This alert occurs when an unexpected Transmission Control Protocol (TCP) packet with a particular flag (for example, Fin, Ack, All, None) is detected. SOLUTION : If logging for dropped packets is enabled, you can view details of this attack in the Firewall log in the log viewer. You can use this log to monitor any further intruder activity. To do this, in the console tree of ISA Server Management, click Monitoring. In the Logging tab, edit the log filter to view the relevant details. Take additional steps against intruder activity. For example, you may want to add access rules denying traffic from the source of the intrusion. To do this, in the console tree of ISA Server Management, click Firewall Policy. On the Tasks tab, click Create Access Rule. |
| Reference Links | Event id: 15102 Source id:DNS Intrusion Detection |
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